As a cell's size increases, the ratio of its surface area to its volume than the surface area increases as the volume increases. Thus, option A is correct.
What happen when the size of the cell increases?
As a cell size becomes enlarge this results in increase in volume and the membrane of the cell also increases. But the volume increases more rapidly then the surface area of the cell. As a result of this the amount of surface area required so as to pass the materials with respect to the unit volume of the cell also decreases.
The surface area of a cell does not grow as fast as the volume does, this means that the greater the diameter of a single-celled organism, the lower will be the surface area to volume ratio.
Therefore, As a cell's size increases, the ratio of its surface area to its volume than the surface area increases as the volume increases. Thus, option A is correct.
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